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Finding the Fourth Proportional to 681,138.56, 939,827.40 and 394,641.20

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Solution

The fourth proportional to 681,138.56, 939,827.40 and 394,641.20 is: 544,521.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,138.56 : 939,827.40 = 394,641.20 : x
  2. Step 2: Convert to fraction form
    681,138.56/939,827.40 = 394,641.20/x
  3. Step 3: Cross multiply
    681,138.56x = 939,827.40 × 394,641.20
  4. Step 4: Simplify right side
    681,138.56x = 370,894,612,928.88
  5. Step 5: Solve for x
    x = 370,894,612,928.88/681,138.56
  6. Step 6: Final answer
    x = 544,521.53

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.